@xiamenese hi,
Heres's my MBP Specs

Hi,
I Love OPERA Browser, Its allow me to multitask with the build in Whatsapp web and Facebook messenger,

I notice something wrong with the build in apps.
I'm using OPERA Browser on my MAC Book Pro.
When I maximise my browser and pin down the build in whatsapp or fb messenger, it seem to go background and unable to be use.

I tried it when not maximise seem to be working fine or maximise but not pinned.

I'm not sure this bug come with the lates updates from Opera/IOS.
I tired to uninstall and installing my Opera Browser and also tried to do recovery.
but its not seem to work at all.

here's some Screen Shot I taken.